From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Procedure for testing the insulation of a machine while it is still hot.
| Identifier | ExFiles\Box 70\4\ scan0091 | |
| Date | 19th December 1927 guessed | |
| -3- Contd. (10) The insulation of the machine should be tested while still hot by applying through a low c.p. 200 volt lamp an alternating voltage of 200 between the windings and the frame, when the lamp should show no sign of being lighted. EFC. | ||